JLM AUDIO

The outside pins should stay at 1k as that is the ends of the trimpot and will never move. The centre wiper pin should come set to roughly half way when the trim pot is new. So 500R from the centre pin to each end pins except for the VU meter trim which has one outside leg shorted to the centre leg...

Hi Joe! Just finished my LA500 build; what a blast! I could use some help though. When calibrating, the Ground and Zero trimpots aren't changing resistance; the VU meter trimpot seems to be adjusting okay though. Here's what I've done: 1. I have a mobile set up, so the best thing I was able to figur...